HW#3 - I’m confused by what a 2% bin size means. I don’t know how
many bins to set for the histogram

JFF Answer:

The grade scale is
from 0% to 100%. So a 2% bin size means breaking the grade scale
into 50 bins if the MINIMUM grade is a zero and a MAXIMUM grade
is a 100.

In order to override the default for the 'histogram' function
in matlab, you can specify the "bin edges" and then the number
of bins. The bin width is (upper limit edge - lower limit
edge)/nbins. See Matlab HELP on 'histogram' for details as to
setting the BinEdges, NumBins, and BinWidth.